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I Have A 2003 D17(dont Know The Suffix I.e. A2) And Want Some Umpff! I Have Been Looking At Simple Upgrades I.e. Headers, Cam Gears, Pulleys, And A New Exuaust. I Eventually Want A Turbo, Is It Possible To Hit About 250-300 Whp Without A Swap? If So, What All Do I Have To Upgrade/modify/add?

 
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there are way too many threads on these kinds of questions, so please use the search button.